The CLS cast iron heat exchanger and boiler design maximize heat transfer for the most efficient use
of fuel?saving valuable heating dollars. With an optional built-in tankless domestic water heater, it can also provide abundant hot water for your household. Add annual fuel efficiencies up to 81.8%
and the CLS Series is an economical choice in home heating. The CLS Series? cast iron heat exchanger, with metal section connectors, is immune to petroleum based chemicals such as anti-freeze, which can deteriorate rubber seals used by some competitors. This means a longer boiler
life and peace of mind for you.